﻿using System.Collections.Generic;
using System.Linq;
namespace SportsStore.Domain.Entities {
public class Cart {
    private List<CartLine> lineCollection = new List<CartLine>();
    public void AddItem(Product product, int quantity) {
        CartLine line = lineCollection
                        .FirstOrDefault(p => p.Product.ProductID ==  product.ProductID);

        if (line == null) {
            lineCollection.Add(new CartLine {
                Product = product,
                Quantity = quantity
            });
        } else {
            line.Quantity += quantity;
        }
    }
    public void RemoveLine(Product product) {
        lineCollection.RemoveAll(l => l.Product.ProductID ==
                                 product.ProductID);
    }
    public decimal ComputeTotalValue() {
        return lineCollection.Sum(e => e.Product.Price * e.Quantity);
    }
    public void Clear() {
        lineCollection.Clear();
    }
    public IEnumerable<CartLine> Lines {
        get { return lineCollection; }
    }
}
public class CartLine {
    public Product Product { get; set; }
    public int Quantity { get; set; }
}
}